一般大气环境下低剪跨比RC框架梁抗震性能试验研究

发布时间：2019-05-13 13:47

【摘要】：为研究一般大气环境下受酸雨侵蚀RC框架梁的抗震性能,在人工气候模拟实验室对7个剪跨比为2.5的RC框架梁试件进行人工模拟酸雨环境(PH=3.0)加速侵蚀试验,随后对其进行拟静力试验,得到不同钢筋锈蚀程度和配箍率下框架梁抗震性能的衰减规律。结果表明:酸雨侵蚀初期,酸化深度较小时,钢筋尚未锈蚀,试件的承载力、刚度、延性和耗能能力略有增加;酸雨侵蚀后期,酸化深度接近钢筋表面时,钢筋开始锈蚀,且锈蚀程度随酸化深度的增大不断加重;随钢筋锈蚀率的增大,试件的强度、刚度、延性和耗能能力均发生不同程度的退化,表现为构件的承载力和变形能力下降;锈蚀程度相近时,随着配箍率的减小,试件的承载力和刚度不断减小,延性和变形恢复力也逐渐降低,抗震能力变弱。
[Abstract]:In order to study the seismic performance of RC frame beams eroded by acid rain in general atmospheric environment, the accelerated erosion tests of seven RC frame beams with shear span ratio of 2.5 were carried out in the artificial climate simulation laboratory. Then the quasi-static test is carried out, and the attenuation law of seismic performance of frame beams with different steel corrosion degree and hoop ratio is obtained. The results show that in the early stage of acid rain erosion, the acidizing depth is small, the steel bar has not been corroded, and the bearing capacity, stiffness, toughness and energy dissipation capacity of the specimen are slightly increased. In the later stage of acid rain erosion, when the acidizing depth is close to the surface of steel bar, the steel bar begins to rust, and the corrosion degree increases with the increase of acidizing depth. With the increase of corrosion rate of steel bar, the strength, stiffness, toughness and energy dissipation capacity of the specimen are degraded to varying degrees, which shows that the bearing capacity and deformation capacity of the member decrease. When the corrosion degree is similar, with the decrease of hoop ratio, the bearing capacity and stiffness of the specimen decrease, the toughness and deformation restoring force also gradually decrease, and the seismic capacity becomes weaker.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家科技支撑计划项目(2013BAJ08B03,2015BAL01B02-04) 国家自然科学基金项目(51678475) 教育部高等学校博士学科点专项科研基金项目(20136120110003)
【分类号】：TU352.11;TU375.4

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